alibaba/kt-connect

package util

import (
    "fmt"
    "math/rand"
    "regexp"
    "strings"
    "time"
    "unicode"
)

func init() {
    rand.Seed(time.Now().UnixNano())
}

var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

// RandomString Generate random string
func RandomString(n int) string {
    b := make([]rune, n)
    for i := range b {
        b[i] = letterRunes[rand.Intn(len(letterRunes))]
    }
    return string(b)
}

// RandomSeconds Generate random duration number in second
func RandomSeconds(min, max int) time.Duration {
    val := rand.Intn(max)
    if val < min {
        val = min
    }
    return time.Duration(val) * time.Second
}

// RandomPort Generate random number [1024, 65535)
func RandomPort() int {
    return rand.Intn(65535-1024) + 1024
}

// String2Map Convert parameter string to real map "k1=v1,k2=v2" -> {"k1":"v1","k2","v2"}
func String2Map(str string) map[string]string {
    res := make(map[string]string)
    splitStr := strings.Split(str, ",")
    for _, item := range splitStr {
        index := strings.Index(item, "=")
        if index > 0 {
            res[item[0:index]] = item[index+1:]
        }
    }
    return res
}

// Append Add segment to a comma separated string
func Append(base string, inc string) string {
    if len(base) == 0 {
        return inc
    } else {
        return fmt.Sprintf("%s,%s", base, inc)
    }
}

// RemoveColor remove shell color character in text
func RemoveColor(msg string) string {
    colorExp := regexp.MustCompile("\033\\[[0-9]+m")
    return colorExp.ReplaceAllString(msg, "")
}

// ExtractErrorMessage extract error from log
func ExtractErrorMessage(msg string) string {
    errExp := regexp.MustCompile(" error=\"([^\"]+)\"")
    if strings.Contains(msg, " ERR ") && errExp.MatchString(msg) {
        return errExp.FindStringSubmatch(msg)[1]
    }
    return ""
}

// Capitalize convert dash separated string to capitalized string
func Capitalize(word string) string {
    prev := '-'
    capitalized := strings.Map(
        func(r rune) rune {
            if prev == '-' {
                prev = r
                return unicode.ToUpper(r)
            }
            prev = r
            return unicode.ToLower(r)
        },
        word)
    return strings.ReplaceAll(capitalized, "-", "")
}

// DashSeparated convert capitalized string to dash separated string
func DashSeparated(word string) string {
    pos := regexp.MustCompile("([^-])([A-Z])")
    dashSeparated := pos.ReplaceAllString(word, "$1-$2")
    dashSeparated = pos.ReplaceAllString(dashSeparated, "$1-$2")
    return strings.ToLower(dashSeparated)
}

// UnCapitalize convert dash separated string to capitalized string
// TODO: 0.4 - remove this method, use DashSeparated() instead
func UnCapitalize(word string) string {
    firstLetter := true
    return strings.Map(
        func(r rune) rune {
            if firstLetter {
                firstLetter = false
                return unicode.ToLower(r)
            }
            return r
        },
        word)
}